Cat food containing pork

We have a couple of cats at home and rely on buying brand cat jelly and dry food. I usually buy fish selection but recently discovered that both of the fish selection cat food brands have traces of pork in the food. It would be difficult to have to make homemade meat for them every day because we have many cats and they eat multiple times a day. Its a must to feed cats meat because otherwise they’ll be unhealthy. So what shall I do? I'm afraid they’ll get sick of eating tuna all the time and they need a lot of nutrition which can be found in these brand foods.